Box holder



FIG. 1 is a rear elevation view of a box holder, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a top rear perspective view thereof;

FIG. 5 is a top front perspective view thereof; and,

FIG. 6 is a top front perspective the view thereof in a condition of use.

The broken lines in FIG. 6 depict environmental structure only and form no part of the claimed design. 

CLAIM I claim the ornamental design for a box holder, as shown and described. 